Motor control and descending pathways

Question 1

lamina with LMNs

Answer 1

9

Question 2

Laminae for local circuit, autonomic, commissural neurons

Answer 2

7-8

Question 3

Fast fatigable (type II fibers) fiber/MN ratio and physiology

Answer 3

high fiber/MN ratio
low myoglobin, mito, capillaries
glycogenolytic

Question 4

slow fatigable (type I fibers) fiber/MN ratio and physiology

Answer 4

low fiber/MN ratio
high myoglobin, mito, capillaries
aerobic metabolism

Question 5

Type II afferent activity

Answer 5

communicates change in fiber length with AP frequency

Question 6

Type Ia afferent activity

Answer 6

communicates change in fiber length and change in velocity with AP frequency

Question 7

Type II and Ia direct or indirect

Answer 7

direct monosynaptic excitatory connection

Question 8

Golgi Tendon (Ib)

Answer 8

Monitors force
in series with mucscle
synapse with local interneurons –> relax and contract different muscles

Question 9

flexor reflex (fire on skin)

Answer 9

uses interneurons

-both for excitatory and inhibitory actions

Question 10

Upper or Lower Motor

-Weakness

Answer 10

both

Question 11

Upper or Lower Motor

-atrophy

Answer 11

LMN - loss of trophic factors

Question 12

Upper or Lower Motor

-Tone

Answer 12

increased in UMN disease

Question 13

Upper or Lower Motor

-Fasciculations

Answer 13

LMN disease

Question 14

Vestibulospinal tract

Answer 14

coordinated head and neck movement

Question 15

reticulospinal tract

Answer 15

coordinated head and neck movement

- breathing and emotional posture

Question 16

rubrospinal tract

Answer 16

control of arm muscle (flexing arm muscles)

Question 17

Colliculospinal ctract

Answer 17

coordinates head and eye movement

makes sense, superior colliculus concerns visual info